Here is an example of his amazing redesign of the Flash Vol. 1 Archive:
First the Bookstore edition:
And the version you will find in your local comic shop:
Here would be my redesign for the Project Pegasus hardcover showing the back cover, spine and front cover. One of the chief improvements I feel I've made is to make the back cover artwork more engaging.
Here's another example of an existing MPC for John Byrne's run on Captain America.
First the local comic shop version:
And now my version.
Lastly, here are two designs for two MPC collections that DON'T exist, but I think should.
Spider-Man: FutureShock (a classic Marvel Team-Up storyline that I have mentioned here before )